JPS61195578U

JPS61195578U -

Info

Publication number: JPS61195578U
Application number: JP7923785U
Authority: JP
Priority date: 1985-05-29
Filing date: 1985-05-29
Publication date: 1986-12-05

Description

[Brief explanation of the drawing]

第１図は従来のモータサーボ回路のブロツク図
、第２図は従来の光学系ピツクアツプの側面図、
第３図はトラツキング誤差検出説明用の側面図、
第４図はオフセツト発生説明用の図、第５図は本
考案の第１の実施例のブロツク図、第６図、第７
図は本考案の第１の実施例に関する記録トラツク
とトラツキング制御用パイロツト信号の関係を示
す平面図、第８図は本考案の第２の実施例のブロ
ツク図、第９図、第１０図は本考案の第２の実施
例に関する記録トラツクとトラツキング制御用パ
イロツト信号の関係を説明する平面図である。１……デイスク、２……記録位置合せ用マーク
信号、３……モータ、６……第１の位相制御回路
、１１……速度制御回路、３１……光学系ピツク
アツプ、３２……トラツキング誤差検出回路、３
３ａ，３３ｂ……ＢＰＦ、３４……切換回路、３
６ａ，３６ｂ……信号レベル検出回路、３７……
差動増幅器、３８……第２の位相制御回路、４６
……切換回路である。 Figure 1 is a block diagram of a conventional motor servo circuit, Figure 2 is a side view of a conventional optical system pickup,
Figure 3 is a side view for explaining tracking error detection.
FIG. 4 is a diagram for explaining offset generation, FIG. 5 is a block diagram of the first embodiment of the present invention, and FIGS.
The figure is a plan view showing the relationship between the recording track and the tracking control pilot signal according to the first embodiment of the present invention, FIG. 8 is a block diagram of the second embodiment of the present invention, and FIGS. 9 and 10 are FIG. 7 is a plan view illustrating the relationship between a recording track and a tracking control pilot signal according to a second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Disk, 2...Mark signal for recording position alignment, 3...Motor, 6...First phase control circuit, 11...Speed control circuit, 31...Optical system pick-up, 32...Tracking error detection circuit, 3
3a, 33b...BPF, 34...Switching circuit, 3
6a, 36b...signal level detection circuit, 37...
Differential amplifier, 38... second phase control circuit, 46
...It is a switching circuit.

Claims

[Claims for Utility Model Registration] 1. Recording and reproducing type video that is performed by detecting the phase error between a reference signal and a mark signal for recording positioning provided on a disk-shaped recording medium having spiral or concentric recording tracks. In the motor servo circuit of the disk player, a tracking control pilot signal having a different frequency is recorded every other track between the recording tracks for a predetermined period at one horizontal scanning period interval, and after the motor is started, the mark signal for recording position alignment is initially recorded. The motor is controlled using the output signal of the first phase control circuit that performs a phase comparison between the mark signal and the first reference signal, and the phase difference between the mark signal and the first reference signal is within a predetermined range. A recording/reproducing type video disk player characterized in that the motor is controlled by using the output signal of a second phase control circuit that compares the phase of the tracking control pilot signal and the second reference signal after the tracking control pilot signal and the second reference signal. motor servo circuit. 2 As a pilot signal for tracking control,
The recording and reproducing type according to claim 1, characterized in that two types of signals having different frequencies are recorded between the recording tracks, and the pilot signal is recorded for a predetermined period at one horizontal scanning cycle interval. Video disc player motor servo circuit.